2010A&A...514A.102T


Query : 2010A&A...514A.102T

2010A&A...514A.102T - Astronomy and Astrophysics, volume 514, A102-102 (2010/5-1)

Groups of galaxies in the SDSS Data Release 7. Flux- and volume-limited samples.

TAGO E., SAAR E., TEMPEL E., EINASTO J., EINASTO M., NURMI P. and HEINAEMAEKI P.

Abstract (from CDS):

We extract groups of galaxies as flux-limited and volume-limited samples from the SDSS Data Release 7 (DR7) to study the supercluster-void network and environmental properties of groups therein. Volume-limited catalogues are particularly useful for a comparison of numerical simulations of dark matter halos and the large-scale structure with observations. The extraction of a volume-limited sample of galaxies and groups requires special care to avoid excluding too much observational data. We use a modified friends-of-friends (FoF) method with a slightly variable linking length to obtain a preliminary flux-limited sample. We take the flux-limited groups as the basic sample to include as many galaxies as possible in the volume-limited samples. To determine the scaling of the linking length we calibrated group sizes and mean galaxy number densities within groups by magnitude dilution of a nearby group sub-sample to follow the properties of groups with higher luminosity limits. Our final flux-limited sample contains 78800 groups and volume-limited subsamples with absolute magnitude limits Mr=-18, -19, -20, and -21 contain 5463, 12590, 18973, and 9139 groups, respectively, in the DR7 main galaxy main area survey. The group catalogue is available at the CDS. The spatial number densities of our groups within the subsamples, as well as the mean sizes and rms velocities of our groups practically do not change from sub-sample to sub-sample. This means that the catalogues are homogeneous and well suited for a comparison with simulations.

Abstract Copyright:

Journal keyword(s): cosmology: observations - large-scale structure of Universe - galaxies: clusters: general - catalogs

VizieR on-line data: <Available at CDS (J/A+A/514/A102): table2a.dat table2b.dat table2c.dat table2d.dat table2e.dat table2f.dat table2g.dat table2h.dat table2i.dat table2j.dat>

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME M 81-82 Group GrG 09 55 +69.1           ~ 692 0
2 ACO 1367 ClG 11 44 44.6 +19 41 59           ~ 1051 1
3 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 496 0
4 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4605 2
5 [EET2007] N152 SCG 13 06.2 -02 34           ~ 39 0
6 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 572 3
7 ACO 2197 ClG 16 28 10.4 +40 54 26           ~ 283 0
8 NAME Local Group GrG ~ ~           ~ 7905 0
9 NAME Sloan Great Wall ? ~ ~           ~ 169 0

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2023.02.07-05:06:09

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